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| 型號(hào)： | 5962-9320601MEA |
| 廠(chǎng)商： | TEXAS INSTRUMENTS INC |
| 元件分類(lèi)： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, CDIP16 |
| 封裝： | DIP-16 |
| 文件頁(yè)數(shù)： | 6/8頁(yè) |
| 文件大小： | 163K |
| 代理商： | 5962-9320601MEA |
UC1907, UC2907, UC3907
LOAD SHARE CONTROLLER
SLUS165B – MARCH 1999 - REVISED MAY 2001
6
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
pin assignments
Adjust Amplifier: (Pins 13, 14, 15) This amplifier adjusts the individual module’s reference voltage to maintain
equal-current sharing. It is a transconductance type in order that its bandwidth may be limited and noise kept
out of the reference-adjust circuitry, with a simple capacitor to ground. The function of this amplifier is to compare
its own module-output current to the share-bus signal, which represents the highest output current. This will
force an adjust command which is capable of increasing the reference voltage as seen by the voltage amplifier
by as much as 100 mV. This number stems from the 17.5:1 internal resistor ratio between the adjust amplifier’s
clamped output and the reference, and represents a 5% total range of adjustment. This value should be
adequate to compensate for unit-to-unit reference and external-resistor tolerances. The adjust amplifier has a
built-in 50-mV offset on its inverting input which will force the unit acting as the master to have a low output,
resulting in no change to the reference. While this 50-mV offset represents an error in current sharing, the gain
of the current amplifier reduces it to only 2.5 mV across the current-sense resistor. It should also be noted that
when the module is acting independently with no connection to the share bus node, or when the share bus node
is shorted to ground, its reference voltage will be unchanged. Since only the circuit acting as a master will have
a low output from the adjust amplifier, this signal is used to activate a flag output to identify the master, should
some corrective action be needed.
Status Indicate: (Pin 16) This pin is an open-collector output intended to indicate the unit which is acting as
the master. It achieves this by sensing when the adjust amp is in its low state and pulling the status-indicate pin
low.
additional information
Please refer to additional application information.
1.
By Mark Jordan, UC3907 Load Share IC Simplifies Parallel Power Supply Design, TI Literature Number
SLUA147.
2.
By Laszlo Balogh, UC3902 Load Share Controller and its Performance in Distributed Power Systems, TI
Literature Number SLUA128.
UDG-94103
Figure 1. Load System Diagram
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